a hangry hippo refers to a person (male or female) of large bone structure (medical term - obese) transferring their anger onto those around them because they are hangry. hangry. Can also be referred to as a 'hangry hangry hippo' when more than 1 meal/snack has been missed

Person #1: What's up with her she's being so nasty to everyone for no reason
Person #2: She hasn't had her lunch break yet & now she's acting like a hangry hippo